Sartorius MC 5, Руководство по обслуживанию

Страница: 27 / 49

Stand 1/94 SARTORIUS MC 5 Balance 27
MC 5
Off-Center Load (Eccentricity)
Checking the Off-Center Loading Tolerances (Eccentricity Test):
Check the off-center loading toleranzes ("corner load“/eccentric
loading error) at the 5 points shown in the diagram on the left.
Off-center test weight: 5g ø: approx. 8mm
Off-center test area:
up to the edge of the weighing pan
Off-center tolerances: ± 0.007mg
If the values measured are out-of-tolerance, re-adjust the off-center
load.
Important Note:
If the off-center loading errors exceed the tolerances, check
the weighing system very carefully (reproducibility / visual
inspection).
Excessive off-center loading errors (> 500 d) indicate that the
weighing system is defective.
In this case, return the microbalance to the factory in
Goettingen, Germany.
Adjusting the Off-Center Loading Tolerances:
Before you begin to make this adjustment, remove the housing
cover from the weighing system.
Adjust the off-center loading tolerances in two steps:
- 3 Point (Coarse Adjustment):
For errors of approx. 50d to approx. 500d.
For coarse adjustment, use the set screws marked 3 and 4.
- 5 Point (Fine Adjustment):
For errors up to approx. 50d.
For fine adjustment, use the set screws marked 1 and 2. Adjust
them by only one complete turn at the most.
For the 1st step, measure the off-center loading error at 3 points.
Following coarse adjustment, measure the off-center loading error
at 5 points and perform fine adjustment, if necessary ( see top
diagram).